SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT [Schedule] Condensed Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating expenses:
Depreciation and amortization									$ 2,748	$ 3,090	$ 3,845
Business reorganization									712	1,580	5,828
Operating income (loss)	$ (1,174)	$ (101)	$ 2,277	$ (725)	$ (671)	$ (786)	$ (2,425)	$ (3,705)	277	(7,587)	3,241
Other income (expense):
Interest income (expense), net									(403)	(357)	(722)
Other income (expense), net									(510)	(247)	(266)
Provision for (benefit from) income taxes from continuing operations									2,284	742	646
Net income (loss)	$ (2,005)	$ (848)	$ 1,226	$ (1,314)	$ (292)	$ (1,873)	$ (3,138)	$ (3,487)	(2,941)	(8,790)	2,329
Parent Company
Operating expenses:
Selling, general and administrative expenses									9,615	10,451	13,327
Depreciation and amortization									359	405	488
Business reorganization									(22)	(16)	1,168
Operating income (loss)									(9,952)	(10,840)	(14,983)
Other income (expense):
Interest income (expense), net									172	197	516
Other income (expense), net									3,442	4,195	5,318
Income (Loss) from Subsidiaries, Net of Tax									3,787	(2,351)	11,466
Income (loss) from continuing operations before provision for income taxes									(6,338)	(6,448)	(9,149)
Provision for (benefit from) income taxes from continuing operations									390	(9)	(12)
Net income (loss)									$ (2,941)	$ (8,790)	$ 2,329